package com.zhiyou.crowdfunding.util;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

public class ImgUtil {

    // 验证码 随机采用的char数组
    private static char[] ch="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".toCharArray();
    public static VerifyImg createVerifyCode(){
        VerifyImg verifyImg=new VerifyImg();
        BufferedImage bfi = new BufferedImage(80,25,BufferedImage.TYPE_INT_RGB);
        Graphics g = bfi.getGraphics();
        g.fillRect(0, 0, 80, 25);
        Random r = new Random();
        int index;
        StringBuffer sb = new StringBuffer(); //保存字符串
        for(int i=0; i<4; i++){
            index = r.nextInt(ch.length);
            g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
            Font font = new Font("宋体", 30, 20);
            g.setFont(font);
            g.drawString(ch[index]+"", (i*20)+2, 23);
            sb.append(ch[index]);
        }

        /*// 添加噪点
        int area = (int) (0.02 * 80 * 25);
        for(int i=0; i<area; ++i){
            int x = (int)(Math.random() * 80);
            int y = (int)(Math.random() * 25);
            bfi.setRGB(x, y, (int) (Math.random() * 255));
        }

        //设置验证码中的干扰线
        for (int i = 0; i < 4; i++) {
            //随机获取干扰线的起点和终点
            int xstart = (int)(Math.random() * 80);
            int ystart = (int)(Math.random() * 25);
            int xend = (int)(Math.random() * 80);
            int yend = (int)(Math.random() * 25);
            g.setColor(interLine(1, 255));
            g.drawLine(xstart, ystart, xend, yend);
        }*/
        verifyImg.setBfi(bfi);
        verifyImg.setCodeStr(sb.toString());
        return verifyImg;
    }


    private static Color interLine(int Low, int High){
        if(Low > 255)
            Low = 255;
        if(High > 255)
            High = 255;
        if(Low < 0)
            Low = 0;
        if(High < 0)
            High = 0;
        int interval = High - Low;
        int r = Low + (int)(Math.random() * interval);
        int g = Low + (int)(Math.random() * interval);
        int b = Low + (int)(Math.random() * interval);
        return new Color(r, g, b);
    }




 public   static class VerifyImg{
        BufferedImage bfi;
        String codeStr;

        public VerifyImg(){}

        public VerifyImg(BufferedImage bfi, String codeStr) {
            this.bfi = bfi;
            this.codeStr = codeStr;
        }

        public BufferedImage getBfi() {
            return bfi;
        }

        public void setBfi(BufferedImage bfi) {
            this.bfi = bfi;
        }

        public String getCodeStr() {
            return codeStr;
        }

        public void setCodeStr(String codeStr) {
            this.codeStr = codeStr;
        }
    }
}
